Milling attachment for lathes.



G. L. ANDERSON & C. D. BACON. MILLING ATTACHMENT FOR LATHES.

APPLICATION FILED MAR. 28. 1914.

1 16mm. Patented 1.... 11, 1916.

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G. L. ANDERSON & C. D. BACON.

MILLING ATTACHMENT FOR LATHES.

APPLICATION FILED MAR- 28,1914. Ljfimfilg, Patented Jan. 11, 1916.

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G. L. ANDERSON & C. D. BACON.

MILLING ATTACHMENT FOR LATHES.

APPLICATION FILED MAR. 28. 1914.

1,167,612. Patented Jan. 11, 1916.

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GEORGE L. ANDERSON AND CHARLES n. BACON, or FARIBAULT, MINNESOTA; SAID BACON ASSIGNOR T0 SAID ANDERSON.

MILLING ATTACHMENT FOR LATHES.

Specification of Letters Patent.

Patented Jan. 11, 11116.

1 Application filed March 28, 1914. Serial No. 827,896.

To all whom it may concern:

Be it known that we, GEORGE L. ANDERSON and CHARLES D. BACON, citizens of the United States, residing at Faribault, in the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Milling Attachments for Lathes; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention has for its object to provide a simple and etficient milling attachment for lathes, by the application of which an ordinary lathe may be converted into a milling machine, and to such ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter de scribed and defined in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a view taken in transverse vertical section through the lathe, and showing the improved milling attachment applied thereto; Fig. 2 is a detail in horizontal section taken approximately on the line 00 m on Fig. 1, some parts being removed; Fig. 3 is a plan view showing a portion of the lathe and the improved milling attachment applied thereto; Fig. 4 is a side elevation of the parts shown in Fig. 8; Fig. 5 is a view corresponding to Fig. 1, but illustrating a milling attachment with an attachment for holding shafts or rods; and Fig. 6 is a detail in side elevation showing the device which is adapted to be applied to the milling attachment to hold work, as shown in Fig. 5.

The lathe illustrated is of standard and well known construction, and the parts thereof may be briefly noted as follows: The numeral 1 indicates the carriage runways, the numeral 2 the face plate, and the numeral 3 the live center, the numeral 4 the tail stock, the numeral 5 the dead center, the numeral 6 the carriage, the numeral 7 the cross feed slide, and the numeral 8 the horizontally adjustable member of the compound rest made up of the slide 7 and the said member 8. The carriage 6, of course, travels horizontally on the runways 1, while the slide 7 is mounted for horizontal sliding movements transversely of the lathe, on suitable guides on the carriage 6, and is given such movements in the customary way by an adjusting screw, the head 9 of which is shown in the drawings. The rest 8 is 0011- nected to the slide 7 for horizontal angular adjustments and is adapted to be given such ad ustments in the usual way, through an adjusting screw 10 and cooperating device not shown.

The numeral 11 indicates a mandrel mounted on the lathe centers 3 and 5, and, as shown, is secured to rotate with the face plate 2 by means of a dog 12. The mandrel 11, as shown, carries a gear cutting milling tool 13, but it may, of course, be provided with a milling tool of any form required for the work to be performed.

The milling attachment, in its preferred form, comprises devices which will now be described.

The numeral 14: indicates an upright guide column formed with true vertical front faces and with clove-tailed edges, and provided with a flanged base 15 formed, as shown, with a T-shaped dove-tail 16 that fits a corresponding groove in the compound rest 8, which groove is customarily provided in the said rest for the application of a tool stock. A nut-equipped stud 17 serves to rigidly clamp the base 15 to the said rest 8. The face of the column let is hollowed out to receive a vertical adjusting screw 18 that is swiveled to the top flange of the said column and provided with an operating hand piece 19.

A vertically adjustable compound rest or work support is mounted on the column 14 and is arranged to be vertically adjusted by the screw 18. This compound rest comprises two members 20 and 21 that are pivotally connected together for angular or pivotal adjustments of the latter, in respect to the former, and are adapted to be locked together in any set adjustment by means of nut-equipped bolts 22. The member 20 has dove-tailed flanges that engage the dovetailed edges of the column 14- and guide the said member 20 for true vertical movements on the column. The screw 18 has threaded engagement with the said member 20, so that it is adapted to move the compound rest 20 and 21 vertically and to hold the same wherever set. The head or member 21 of the verticallyadjustable compound rest or work support has a diametrically extended rotary sleeve 23 provided at one end with a worm gear 24; and at its other end with a threaded shank 25, to which latter a face plate may be secured. The face plate, not shown, will be of the usual or any suitable construction and would be desirable for holding irregular objects. The worm gear at is engaged by a worm 26 of a spindle 27 that is journaled in a bearing 21 carried by the member 21. The spindle 27 has a radial arm 28 provided with a pointer 29 that is engageable with perforations of a divider dial 30, secured to the said bearing 21. The said parts 23 to 30, inclusive, are of the usual construction provided in milling machines and their op erations are well understood.

Mounted to slide vertically on the dovetailed edges of the columns 1%, below the member 20 is a work steadying bracket 31 provided with a screw rod 32. In Figs. 1. to 4, inclusive, the character 3 indicates a gear secured on a mandrel 33 that is extended through the sleeve 23 and securely clamped therein for rotation therewith by a nut 3% applied to one end of said mandrel.

Preferably, the said mandrel and the seat therefor in the sleeve 23 are slightly tapered so that they will be securely clamped together under friction when the nut 34 is tightened.

Here it is highly important to note that the gear y, by means of the column 1 1 and vertical. compound rest or support 20-21, is supported in a position above the cutter or milling tool 13. This arrangement enables very large gears to be cut on a horizontal lathe- In some previous arrangements, the gear or other work to be cut is supported below the milling tool, and when this is done, only comparatively small gears can be cut, because of the little clearance between the cutting tool support on the lathe centers, and underlying portions of the lathe carriage and bed plate. With my improved arrangement, the size of a gear which may be cut is limited only by the height of the supporting column. In cutting large gears, the milling tool has a tendency to cause the gear to tremble or vibrate, and this may be prevented by adjusting the bracket 31 and screw 32, so that the latter will bear against the rim of the gear close to the point where the cutting tool operates thereon, and on that side of the gear where the said screw rod acts as an abutment against which the rim of the gear is forced by the action of the milling tool. The bracket 31 being vertically adjustable independently of the compound rest 2021, the screw rod 32 may, as is obvious, be properly adjusted for engagement with the gears or other articles of a different diameter or size.

Figs. 5 and 6 illustrate an arrangement for holding shafts or similar elongated articles, so that key seats may be cut longibe accomplished by the milling tool.

tudinally therein, or other work such as squaring of shafts or a portion'thereof, may The construction here employed is like that previously described, except that the member 21 of the vertical compound rest or work sup port is removed and there is substituted therefor, a two-part chuck made up of mem bore 35 and 36 clamped together by nutequipped studs 37. The members 35 and 36 are provided with opposing J-shaped notches that are adapted to clamp and se curely hold the shaft 11 The member 35 will be adjustably secured to the member 20 by the same means employed to connect thereto, the above described pivotally adjustable member 21. Obviously, the chuck 35 and 36 may be secured to the member 20 with the shaft g either in a horizontal position or in an oblique position, depending on the character of the work that is to be done. In cutting key-ways or doing light work, the shaft will, of course be fed transversely of the lathe by the proper feed movements of the cross feed slide 7, and the same movements will serve to feed the gear 3/ to the milling tool in the previously described arrangement.

lVhat we claim is:

1. The combination with the live and dead centers and the carriage and cross feed slide of a lathe, of a column carried by the said cross feed slide and provided with means for holding work at a point above the horizontal line of the said live and dead centers, and a work steadying device'located below said work support and independently adjustable on said column and projecting horizontally outward therefrom.

2. The combination with the live and dead centers and the carriage and cross feed slide of a lathe, of a column carried by the said cross feed slide, and provided with means for holding work at apoint above the horizontal line of said live and dead centers, a work steadying bracket located below said work support and vertical adjustments therefor on said column, and a work steadying screw applied to said bracket and engageable with the work in the vicinity of the point of action of the cutting tool thereon and projecting horizontally outward there from.

In testimony whereof we affix our signatures in presence of two witnesses.

GEORGE L. ANDERSON. 7 CHARLES DRAGON.

lVitnesses as to George L. Anderson: ARTHUR A. Konscn,

C. M. STOCKTON. Viitnesses as to CharlesD. Bacon: Cnani orrn L. BACON,

G. M. STOCKTON.

Ionics of this patent may be obtained for five cents each, by addressing the Commissioner of Eatehts, Washington, D. C. 

